dotnet-combined =
    (
      with pkgs.dotnetCorePackages;
      combinePackages [
        sdk_10_0-bin
        sdk_9_0-bin
        sdk_8_0-bin
      ]
    ).overrideAttrs
      (old: {
        src = old.src.overrideAttrs (old: {
          postBuild =
            (old.postBuild or "")
            # This is needed to install workload in $HOME
            + ''
              for i in $out/share/dotnet/sdk/*
              do
                i="$(basename $i)"
                i="''${i/-*}" # strip pre-release label
                i="''${i::-2}00" # strip patch

                mkdir -p "$out/share/dotnet/metadata/workloads/$i"
                touch "$out/share/dotnet/metadata/workloads/$i/userlocal"
              done
            '';
        });
      });

this works as a workaround for installing workloads in home